Medical Dictionary

beta-galactosidase be·ta-ga·lac·to·si·dase (bā'tə-gə-lāk'tō-sĭ-dās', -dāz', -lāk-tō'-)
An enzyme occurring in certain yeasts and in the intestinal juices of mammals, especially one that catalyzes the hydrolysis of lactose into glucose and galactose. Also called lactase.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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